First Presidential Debate 2012

US President Barack Obama (R) and Republican challenger Mitt Romney shake hands following their first debate at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney went head-to-head in their debut debate. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama (top) speaks during his debate with Republican Presidential candidate Mitt Romney (bottom) at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama (R) and Republican presidential candidate Mitt Romney (L) arrive for the first presidential debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney went head-to-head in their debut debate. (credit: SAUL LOEB/AFP/GettyImages)

First Presidential Debate 2012

Republican presidential candidate Mitt Romney speaks during his debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama speaks during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama greets Republican presidential candidate Mitt Romney October 3, 2012 as he arrives on stage for the first presidential debate at the University of Denver in Denver, Colorado. (credit: MANDEL NGAN/AFP/GettyImages)

First Presidential Debate 2012

US First Lady Michelle Obama points to moderator Jim Lehrer before the start of the first presidential debate October 3, 2012 at the University of Denver in Denver, Colorado. Next to Obama sits US Senator from Colorado Michael Bennet. (credit: MANDEL NGAN/AFP/GettyImages)

First Presidential Debate 2012

Republican presidential candidate Mitt Romney participates in the first presidential debate with US President Barack Obama at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012, moderated by Jim Lehrer of the PBS NewsHour. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: SAUL LOEB/AFP/GettyImages)

First Presidential Debate 2012

Jim Lehrer, of the PBS Newshour, speaks to the audience before moderating the first presidential debate between US President Barack Obama and Republican challenger Mitt Romney in Denver,Colorado on October 3, 2012. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama (R) and Republican presidential candidate Mitt Romney (L) arrive for their debate at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: SAUL LOEB/AFP/GettyImages)

First Presidential Debate 2012

Republican presidential candidate Mitt Romney hugs one of his grandchildren as Ann Romney watches at the conclusion of the first presidential debate in Denver, Colorado, October 3, 2012. (credit: SAUL LOEB/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama (R) kisses First Lady Michelle Obama in Denver, Colorado, on October 3, 2012 at the end of the first presidential debate with Republican presidential candidate Mitt Romney. (credit: SAUL LOEB/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama speaks during his debate with Republican Presidential candidate Mitt Romney at Magness Arena at the University of Denver in Denver, Colorado, October 3, 2012. After hundreds of campaign stops, $500 million in mostly negative ads and countless tit-for-tat attacks, Obama and Romney go head-to-head in their debut debate. (credit: NICHOLAS KAMM/AFP/GettyImages)

First Presidential Debate 2012

US President Barack Obama and Republican presidential candidate Mitt Romney wave October 3, 2012 after shaking hands as he arrives on stage for the first presidential debate at the University of Denver in Denver, Colorado.(credit: MANDEL NGAN/AFP/GettyImages)

First Presidential Debate 2012

Democratic presidential candidate, U.S. President Barack Obama (L) walks away from Republican presidential candidate, former Massachusetts Gov. Mitt Romney (R) after the Presidential Debate at the University of Denver on October 3, 2012 in Denver, Colorado. The first of four debates for the 2012 Election, three Presidential and one Vice Presidential, is moderated by PBS's Jim Lehrer and focuses on domestic issues: the economy, health care, and the role of government. (credit: Win McNamee/Getty Images)